e heap sort combines the best of both merge sort and insertion sort. Like merge sort, the worst case time of
heap sort is O(n log n) and like insertion sort, heap sort sorts by inserting the element in its appropriate posi-
tion [in-place]. e heap sort algorithm starts by using procedure BUILD-HEAP to build a heap on the input
array A[1:n]. Since the maximum element of the array stored at the root is A[1], it can be put into its correct
nal position by exchanging it with A[n] (the last element in A). Now discard node n from the heap then the
remaining elements can be made into a heap. Note that the new element at the root may violate the heap prop-
erty. All that is needed ...
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